package common.spring.test;

/*
 * Copyright 2002-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.TestContext;
import org.springframework.test.context.TestContextManager;
import org.springframework.test.context.TestExecutionListeners;
import org.springframework.test.context.support.DependencyInjectionTestExecutionListener;
import org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener;
import org.springframework.test.context.support.DirtiesContextTestExecutionListener;
import org.springframework.test.context.testng.AbstractTransactionalTestNGSpringContextTests;
import org.springframework.test.context.web.ServletTestExecutionListener;
import org.testng.IHookCallBack;
import org.testng.IHookable;
import org.testng.ITestResult;
import org.testng.annotations.AfterClass;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.BeforeMethod;

/**
 * Abstract base test class which integrates the <em>Spring TestContext Framework</em>
 * with explicit {@link ApplicationContext} testing support in a <strong>TestNG</strong>
 * environment.
 *
 * <p>
 * Concrete subclasses:
 * <ul>
 * <li>Typically declare a class-level {@link ContextConfiguration
 * &#064;ContextConfiguration} annotation to configure the {@link ApplicationContext
 * application context} {@link ContextConfiguration#locations() resource locations}
 * or {@link ContextConfiguration#classes() annotated classes}. <em>If your test
 * does not need to load an application context, you may choose to omit the
 * {@link ContextConfiguration &#064;ContextConfiguration} declaration and to
 * configure the appropriate
 * {@link org.springframework.test.context.TestExecutionListener TestExecutionListeners}
 * manually.</em></li>
 * <li>Must have constructors which either implicitly or explicitly delegate to
 * {@code super();}.</li>
 * </ul>
 *
 * <p>
 * The following {@link org.springframework.test.context.TestExecutionListener
 * TestExecutionListeners} are configured by default:
 *
 * <ul>
 * <li>{@link org.springframework.test.context.web.ServletTestExecutionListener}
 * <li>
 * {@link org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener}
 * <li>{@link org.springframework.test.context.support.DependencyInjectionTestExecutionListener}
 * <li>{@link org.springframework.test.context.support.DirtiesContextTestExecutionListener}
 * </ul>
 *
 * @author Sam Brannen
 * @author Juergen Hoeller
 * @since 2.5
 * @see ContextConfiguration
 * @see TestContext
 * @see TestContextManager
 * @see TestExecutionListeners
 * @see ServletTestExecutionListener
 * @see DirtiesContextBeforeModesTestExecutionListener
 * @see DependencyInjectionTestExecutionListener
 * @see DirtiesContextTestExecutionListener
 * @see AbstractTransactionalTestNGSpringContextTests
 * @see org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests
 */
//@TestExecutionListeners({ ServletTestExecutionListener.class, DirtiesContextBeforeModesTestExecutionListener.class,
//        DependencyInjectionTestExecutionListener.class, DirtiesContextTestExecutionListener.class })
@ContextConfiguration(locations = { "classpath:spring/spring-test-config.xml" })
@TestExecutionListeners({ ServletTestExecutionListener.class, DirtiesContextBeforeModesTestExecutionListener.class,
        DependencyInjectionTestExecutionListener.class, DirtiesContextTestExecutionListener.class })
public abstract class BaseSpringTestNG implements IHookable, ApplicationContextAware
{
    
    /** Logger available to subclasses */
    protected final Log logger = LogFactory.getLog(getClass());
    
    /**
     * The {@link ApplicationContext} that was injected into this test instance
     * via {@link #setApplicationContext(ApplicationContext)}.
     */
    protected ApplicationContext applicationContext;
    
    private final TestContextManager testContextManager;
    
    private Throwable testException;
    
    /**
     * Construct a new AbstractTestNGSpringContextTests instance and initialize
     * the internal {@link TestContextManager} for the current test.
     */
    public BaseSpringTestNG()
    {
        this.testContextManager = new TestContextManager(getClass());
    }
    
    /**
     * Set the {@link ApplicationContext} to be used by this test instance,
     * provided via {@link ApplicationContextAware} semantics.
     *
     * @param applicationContext the ApplicationContext that this test runs in
     */
    @Override
    public final void setApplicationContext(ApplicationContext applicationContext)
    {
        this.applicationContext = applicationContext;
    }
    
    /**
     * Delegates to the configured {@link TestContextManager} to call
     * {@link TestContextManager#beforeTestClass() 'before test class'}
     * callbacks.
     *
     * @throws Exception if a registered TestExecutionListener throws an
     *             exception
     */
    @BeforeClass(alwaysRun = true)
    protected void springTestContextBeforeTestClass() throws Exception
    {
        this.testContextManager.beforeTestClass();
    }
    
    /**
     * Delegates to the configured {@link TestContextManager} to
     * {@link TestContextManager#prepareTestInstance(Object) prepare} this test
     * instance prior to execution of any individual tests, for example for
     * injecting dependencies, etc.
     *
     * @throws Exception if a registered TestExecutionListener throws an
     *             exception
     */
    @BeforeClass(alwaysRun = true, dependsOnMethods = "springTestContextBeforeTestClass")
    protected void springTestContextPrepareTestInstance() throws Exception
    {
        this.testContextManager.prepareTestInstance(this);
    }
    
    /**
     * Delegates to the configured {@link TestContextManager} to
     * {@link TestContextManager#beforeTestMethod(Object,Method) pre-process}
     * the test method before the actual test is executed.
     *
     * @param testMethod the test method which is about to be executed.
     * @throws Exception allows all exceptions to propagate.
     */
    @BeforeMethod(alwaysRun = true)
    protected void springTestContextBeforeTestMethod(Method testMethod) throws Exception
    {
        this.testContextManager.beforeTestMethod(this, testMethod);
    }
    
    /**
     * Delegates to the {@link IHookCallBack#runTestMethod(ITestResult) test
     * method} in the supplied {@code callback} to execute the actual test
     * and then tracks the exception thrown during test execution, if any.
     *
     * @see org.testng.IHookable#run(org.testng.IHookCallBack,
     *      org.testng.ITestResult)
     */
    @Override
    public void run(IHookCallBack callBack, ITestResult testResult)
    {
        callBack.runTestMethod(testResult);
        
        Throwable testResultException = testResult.getThrowable();
        if(testResultException instanceof InvocationTargetException)
        {
            testResultException = ((InvocationTargetException) testResultException).getCause();
        }
        this.testException = testResultException;
    }
    
    /**
     * Delegates to the configured {@link TestContextManager} to
     * {@link TestContextManager#afterTestMethod(Object, Method, Throwable)
     * post-process} the test method after the actual test has executed.
     *
     * @param testMethod the test method which has just been executed on the
     *            test instance
     * @throws Exception allows all exceptions to propagate
     */
    @AfterMethod(alwaysRun = true)
    protected void springTestContextAfterTestMethod(Method testMethod) throws Exception
    {
        try
        {
            this.testContextManager.afterTestMethod(this, testMethod, this.testException);
        }
        finally
        {
            this.testException = null;
        }
    }
    
    /**
     * Delegates to the configured {@link TestContextManager} to call
     * {@link TestContextManager#afterTestClass() 'after test class'} callbacks.
     *
     * @throws Exception if a registered TestExecutionListener throws an
     *             exception
     */
    @AfterClass(alwaysRun = true)
    protected void springTestContextAfterTestClass() throws Exception
    {
        this.testContextManager.afterTestClass();
    }
    
}
